Firstly Check you java version and installed eclipse version because
the error that you are getting is occurred mainly due to:
-incompatible sdk and jdk versions
-using a 32 bit java version for your 64 bit eclipse JVM (programfilex86-java)
Firstly check the eclipse.ini file to see if you have a path that is pointing to your jdk it should look something like this
if not then locate the jdk 7 javaw.exe file
paste -vm and the path below it into your eclipse.ini file
make sure that you type the above just before the -vmargs and after the OpenFile
Hope it resolves your query.
If you have any further issue,please let us know.